It doesn’t strike me as obvious to move Robinson Cano off of second base to accommodate Dee Gordon. It could happen, but Cano has reiterated his expectation to play second base in 2019 and Dee is far from guaranteed to produce enough at his natural position to justify displanting Cano.
Plus, the Mariners didn’t go into 2018 thinking less than 450 innings in center field would tell them all they need to know about Dee Gordon the outfielder, and I doubt that mindset has changed much. Giving him the starting center field job is a real possibility in that case, but the front office surely recognizes that the early results were not encouraging.